Stateless MCP: how it changes the way agents call tools

MCP’s July 28, 2026 revision replaces session-based communication with stateless, self-contained requests, removing the required `initialize` handshake and `Mcp-Session-Id` header while moving protocol version, client identity, and capabilities into each request’s metadata. The change allows any server instance behind standard load balancers, serverless platforms, or edge infrastructure to handle a request, reduces initial tool-call latency, and makes tool-list responses safely cacheable with freshness and scope hints. New required routing headers let gateways inspect tool calls without parsing JSON-RPC bodies, while optional `server/discover` capability discovery and specific error codes support version negotiation. Clients must continue to support legacy session-based servers during migration, detecting server type carefully and avoiding downgrade after authentication, network, or server failures. Application state is now carried through explicit handles returned by tools, while long-running work should use durable task identifiers; although transport retries are simpler, side-effecting operations still require idempotency controls or status checks.

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